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Leaching method of lithium iron phosphate waste battery positive electrode material

A cathode material, a technology of lithium iron phosphate, applied in the field of leaching cathode materials of lithium iron phosphate waste batteries, can solve the trouble of storage, transportation and use of industrial pure oxygen, uneconomical self-use of industrial pure oxygen, and small amount of industrial pure oxygen, etc. problems, to achieve obvious economic and environmental benefits, reduce pollution control costs, and low costs

Inactive Publication Date: 2014-04-30
SICHUAN NORMAL UNIVERSITY
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  • Summary
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  • Description
  • Claims
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Problems solved by technology

The consumption of nitric acid in the nitric acid leaching method is large, and a large amount of nitrogen oxides will be produced, polluting the environment
All wet processes have the problem of how to economically increase the leaching speed, increase the metal leaching rate, and reduce the consumption of acid and other auxiliary materials.
Although the pure oxygen leaching method in the nitric acid processing industry and the pure oxygen leaching method in the mixed acid processing industry have solved the above problems, the leaching equipment is more complicated, and the amount of industrial pure oxygen required for the leaching of waste batteries is not large, and waste battery treatment enterprises produce on-site Industrial pure oxygen is not economical for personal use, and the storage, transportation and use of industrial pure oxygen are troublesome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: Add 100g of lithium iron phosphate waste battery cathode material (containing 4.3% lithium, 5.2% aluminum, and iron 34.8%) into a 2L stainless steel reactor, add 1.5mol / L sulfuric acid 920ml, add (NH 4 ) 2 SO 3 39g (200ml solution), stirred at 40℃~50℃ (stirring speed 80r / min) for leaching for 2.5h, after leaching, liquid-solid separation is performed to obtain 1180ml leaching solution (without leaching residue washing water). The leaching rates of lithium, aluminum, and iron were 99.3%, 0.01%, and 99.2%, respectively (calculated based on the lithium, aluminum, and iron in the leaching solution and the washing solution of the leaching residue).

Embodiment 2

[0013] Example 2: Add 300g of lithium iron phosphate waste battery cathode material (containing 4.3% lithium, 5.2% aluminum, and 34.8% iron) into a stainless steel reactor with a volume of 5L, add 1700ml of 3.0mol / L sulfuric acid, and add (NH 4 ) 2 SO 3 129g (700ml solution), leached at 70℃~80℃ (stirring speed 70r / min) for 1h. After leaching, liquid-solid separation is performed to obtain 2200ml leaching solution (excluding leaching residue washing water). The leaching rates of lithium, aluminum and iron are respectively 99.6%, 0.01% and 99.4% (calculated based on the lithium, aluminum and iron in the leaching solution and the washing solution of the leaching residue).

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Abstract

The invention provides a leaching method of a lithium iron phosphate waste battery positive electrode material, which comprises the following steps: putting a positive electrode material subjected to roasting pretreatment separated from lithium iron phosphate waste batteries into a pressure-resistant sulfuric-acid-corrosion-resistant container, pumping sulfuric acid into the container, sealing the container, pumping a (NH4)2SO3 solution into the container by using a filling pump, closing the (NH4)2SO3 solution inlet valve, and leaching.

Description

technical field [0001] The invention relates to a method for leaching the cathode material of lithium iron phosphate waste batteries. Background technique [0002] Lithium iron phosphate batteries (batteries whose positive electrode materials contain lithium, aluminum and iron as the main metal elements) are a new type of batteries, which will produce a large number of waste batteries after they are used and discarded. If this type of battery is discarded into the environment, it will cause great direct and potential harm to the environment. The positive electrode material of lithium iron phosphate battery mainly contains lithium, aluminum and iron, and the total content of lithium is as high as 4%, which is very valuable for recycling. At present, the process of recovering lithium from the positive electrode material of lithium iron phosphate waste battery is mainly wet process. Leaching is an essential process in the wet process. At present, the leaching methods of lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/08C22B21/00C22B26/12
CPCY02P10/20
Inventor 龙炳清林春李贵
Owner SICHUAN NORMAL UNIVERSITY
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